Malicious PDF — malware analysis report

Static analysis result for SHA-256 d456f47e6c5dfb25…

MALICIOUS

PDF

77.4 KB Created: 2021-02-26 18:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1cc175450b7a31117ac5f0ce19ee7844 SHA-1: d58816ee63210b6eb86cd88e332770994875c23e SHA-256: d456f47e6c5dfb25fa9c0c636d2c8574a5d5fbe253999b84796f466784a0d5fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external URIs, with one specifically identified as a potential phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a user manual, suggesting a social engineering pretext to drive users to malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=empi+tens+unit+user+manual PDF link annotation
    • http://xojuxelase.medianewsonline.com/67733563107.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/janaxunafokilonafomokif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_60130c2fa1a86.pdfIn PDF document text
    • https://cdn.sqhk.co/bajafigotuvi/gjeLhiX/impulse_response_guitar_cabinet_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/agjC6jh/recette_sandwich_mou_facile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5ff4e33177434.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moposafasamik.rf.gd/trombosis_venosa_profunda_causas.pdfIn PDF document text
    • http://kufalogomisag.epizy.com/avast_for_pc_windows_7_free.pdfIn PDF document text
    • http://dezabefuzureb.rf.gd/timatem.pdfIn PDF document text
    • http://watekiz.rf.gd/35885948664.pdfIn PDF document text
    • http://vopawolug.epizy.com/94198164304.pdfIn PDF document text
    • http://vuropomap.epizy.com/blacksmith_workshop.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/xuzigoxaborafafijojube.pdfIn PDF document text
    • http://doxekapop.rf.gd/biological_anthropology_of_the_human_skeleton.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/best_books_about_stock_market_crashes.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/fafagajirugatuzikas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 4924 bytes
SHA-256: 6eb73287277aa5078645a676dff1553d3a993720ffede6ac817392a02ab41309
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 10908 bytes
SHA-256: de74bcb39f352697540d8281f394a73a163b0f66165cb0ebb5d1163f2c913ad7

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